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US 8,770,673 B2Granted
Brake device for a motor vehicle having a pressure accumulator
AssigneeRobert Bosch GmbH
InventorsGebhard Wuerth, Volker Mehl, Michael Kunz, Matthias Leiblein, Werner Quirant
Life of this patent
Estimating the term…
Abstract
In a brake device for a motor vehicle having a first and a second hydraulic brake circuit, the second brake circuit is decoupled from the main brake cylinder in partial braking operations, and is operated with the aid of a pressure accumulator controlled by a control device, which takes an additional deceleration effect due to an active power component, e.g., a generator, into account.
Claims17
A brake device for a motor vehicle, comprising:
- at least one first hydraulic brake circuit of a first brake circuit group;
- at least one second hydraulic brake circuit of a second brake circuit group, wherein a wheel braked by the at least one second hydraulic brake circuit of the second brake circuit group is connected to an active power component exerting a decelerating effect;
- a brake-pressure generation device, wherein the at least one first hydraulic brake circuit is connected to the brake-pressure generation device by a controllable hydraulic valve;
- a hydraulic isolation valve configured to selectively and hydraulically decouple the at least one second hydraulic brake circuit from the brake-pressure generation device;
- and
- a pressure accumulator connected to the pressure side of the at least one second hydraulic brake circuit by a controllable compensation valve.
3 more elements
A method for controlling a brake device for a motor vehicle, comprising:
- providing at least one first hydraulic brake circuit of a first brake circuit group;
- providing at least one second hydraulic brake circuit of a second brake circuit group;
- providing a brake-pressure generation device, wherein the at least one first hydraulic brake circuit is connected to the brake-pressure generation device by a controllable hydraulic valve;
- providing a hydraulic isolation valve configured to selectively and hydraulically decouple the at least one second hydraulic brake circuit from the brake-pressure generation device;
- providing a pressure accumulator connected to the pressure side of the at least one second hydraulic brake circuit by a controllable compensation valve;
- wherein a wheel braked by the at least one second hydraulic brake circuit of the second brake circuit group is connected to an active power component exerting a decelerating effect.
3 more elements
A method for controlling a brake device for a motor vehicle, comprising:
- providing at least one first hydraulic brake circuit of a first brake circuit group;
- providing at least one second hydraulic brake circuit of a second brake circuit group;
- providing a brake-pressure generation device, wherein the at least one first hydraulic brake circuit is connected to the brake-pressure generation device by a controllable hydraulic valve;
- providing a hydraulic isolation valve configured to selectively and hydraulically decouple the at least one second hydraulic brake circuit from the brake-pressure generation device;
- providing a pressure accumulator connected to the pressure side of the at least one second hydraulic brake circuit by a controllable compensation valve;
- wherein for partial braking, the controllable compensation valve is opened partially to control the pressure in the at least one second hydraulic brake circuit of the second brake circuit group.
3 more elements
A method for controlling a brake device for a motor vehicle, comprising:
- providing at least one first hydraulic brake circuit of a first brake circuit group;
- providing at least one second hydraulic brake circuit of a second brake circuit group;
- providing a brake-pressure generation device, wherein the at least one first hydraulic brake circuit is connected to the brake-pressure generation device by a controllable hydraulic valve;
- providing a hydraulic isolation valve configured to selectively and hydraulically decouple the at least one second hydraulic brake circuit from the brake-pressure generation device;
- providing a pressure accumulator connected to the pressure side of the at least one second hydraulic brake circuit by a controllable compensation valve;
- monitoring the pressure accumulator;
- and
- for a full braking operation when the pressure accumulator is insufficiently charged, opening the isolation valve and supplying hydraulic fluid by the brake-pressure generation device into the at least one second hydraulic brake circuit of the second brake circuit group.
5 more elements
A method for controlling a brake device for a motor vehicle, comprising:
- providing at least one first hydraulic brake circuit of a first brake circuit group;
- providing at least one second hydraulic brake circuit of a second brake circuit group;
- providing a brake-pressure generation device, wherein the at least one first hydraulic brake circuit is connected to the brake-pressure generation device by a controllable hydraulic valve;
- providing a hydraulic isolation valve configured to selectively and hydraulically decouple the at least one second hydraulic brake circuit from the brake-pressure generation device;
- providing a pressure accumulator connected to the pressure side of the at least one second hydraulic brake circuit by a controllable compensation valve, wherein a wheel braked by the at least one second hydraulic brake circuit of second brake circuit group is connected to an active power component which exerts a decelerating effect;
- providing a control device to ascertain the brake deceleration to be achieved by the at least one second hydraulic brake circuit of the second brake circuit group by taking into account:
- a braking request, a decelerating effect achieved by the at least one brake circuit of the first group and the known decelerating torque of the active power component;
- and
- setting the brake deceleration to be achieved using the compensation valve.
6 more elements
Dependencies are inferred from the claim text.